Bib cock



Feb. 5,1924. 1MM@ T. Hi ROBERTS BIB COCK Filed Nov. 14 1921 wkmwwwu, NKWJMM f Patented Feb., tia, i924.,

INIANUFAGTURING CO'LVIANY, OF DETROET, lllGHIGAll', A COREGRATION OF MICHL BIB COCK.

Application filed November 14, 1921.

in improved arrangement oiE packing, formino; seals between the casing and a cap clos- 'he opening admitti Y the valve member, between said cap and the valve stem .cj therethrough, Without offering unrictional resistance to turning of Said 1e accompanying drawing comprises a. sectional view ci abib cock employing the improved paclring.

in said view l is a casing oi a standard l let B outlet C, and

f 'te seating e. Y i@ is a valve conti'oll ity the it in said partition and navire' its stem G formed with an enlarged portion H engaging an interiorly threaded cylindrical portion l of the casH ing. l is screw cap closing the portion l and having substantially conical central recess through which the stem G passes. The por ion l is countersnnk slightly, as indii at l'f, to permit a Washer L embracing the stem to seat flush with the rim of said portion. Upon said Washer are seated inner and outer packing rings M and N, the former snugly embracing the stem owing to 'a compression effected by the vvall of the i recess in the cap. The outer ips the rim oi the portion l ed by an annular shoulder conical the d. is primary advantage derived by the invention is the independent seating of the tivo packing rings, avoiding any transmission of compression stresses from one to the otherV This arrangement avoids binding oi? the stem by its embracing packing. Such bindfrequently occurs when the stem sealing ri. is required to transmit a compression stress 'to the ring establishing a seal between Serial No. 514,852.

the cap and casing. Preferably the ring lvl is formed, at least in part, oic a ibrous terial, and the outer ring N is oi rubber. Jalso it is preferred to give the inner ring a thickness somewhat greater than that ot the outer one so that the former may extenfup into engagement with the conical central portion oi' the cap.

vWhat l claim as my invention is l. ln a valve, the combination with a casing, having an opening :tor the introduction ci a valve member, of a cap closing said opening, a valve member adapted to seat Within said casing, a stem for said valve member passing through said cap, a packing establishingl a seal between the cap and the casing, a packing establishing a seal between the stem and the cap, and a common' seat for said paclings upon which they are independently compressed by said cap.

2. In a valve, the combination with a casing, having an opening for the introduction of valve member, of a cap closing said opening, a valve member adapted to seat Within said casing, a stem tor said valve member passing through said cap, a Washer seated Within said opening of the casing flush with the margin of said opening, and inner and outer packing rings independently compressed upon said Washer by said cap, the 'former establishing a seal between the cap and stem and the latter between the cap and casing.

ln a valve, the combination With a cas ing having an openingl 'for the introduction of a valve member, of a cap closing said opening formed With a substantially conical central recess, a valve member seated Within said casing, a stem for said member passing centrally through said cap, a Washer embracing said stem and engaging said casing, a paclring ring compressed by an annular portion of said cap against said casing and said Washer, and a packing ring` embracing said stein Within the ring aiore said and compressed against said Washer by engagement With the Wall of the conical recess in said cap.

el. ln a valve, the combination with a casing having an opening for the introduction of a valve member, oi a cap closing said opening and formed with a substantially conical central recess, a valve member seated Within said casing, a stem for said member Washer, and a packing ring embracing Said passing centrally through said cap, said casstem Within rthe ring aforesaid and coming having a counter-sunk portion, a Washer` pressed against said Washer by engagement 10 embracing said stem and located in the with the Wall of the conical recess in said counter-sunk portion of said casing, a packcap.

ing ring compressed by an annular portion In testimony whereof I alhx my signature.

of the cap against said casing and said THOMAS HERBERT ROBERTS. 

